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Littérature scientifique sur le sujet « Kinetic of combustion »

Auteur : Grafiati

Publié le 16 mai 2023

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Articles de revues sur le sujet "Kinetic of combustion"

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Qin, Yuelin, Qingfeng Ling, Wenchao He, Jinglan Hu et Xin Li. « Metallurgical Coke Combustion with Different Reactivity under Nonisothermal Conditions : A Kinetic Study ». Materials 15, n^o 3 (27 janvier 2022) : 987. http://dx.doi.org/10.3390/ma15030987.

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The combustion characteristics and kinetics of high- and low-reactivity metallurgical cokes in an air atmosphere were studied by thermogravimetric instrument. The Coats–Redfern, FWO, and Vyazovkin integral methods were used to analyze the kinetics of the cokes, and the kinetic parameters of high- and low-reactivity metallurgical cokes were compared. The results show that the heating rate affected the comprehensive combustion index and combustion reaction temperature range of the cokes. The ignition temperature, burnout temperature, combustion characteristics, and maximum weight-loss rate of low-reactivity coke (L-Coke) were better than high-reactivity coke (H-Coke). Low-reactivity coke had better thermal stability and combustion characteristics. At the same time, it was calculated via three kinetic analysis methods that the combustion activation energy gradually decreased with the progress of the reaction. The coke combustion activation energy calculated by the Coats–Redfern method was larger than the coke combustion activation energy calculated by the FWO and Vyazovkin methods, but the laws were consistent. The activation energy of L-Coke was about 4~8 kJ/mol more than that of H-Coke.

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Zhang, Yong Feng, Xiang Yun Chen, Quan Zhou, Qian Cheng Zhang et Chun Ping Li. « Combustion Kinetic Analysis of Lignite in Different Oxygen Concentration ». Advanced Materials Research 884-885 (janvier 2014) : 37–40. http://dx.doi.org/10.4028/www.scientific.net/amr.884-885.37.

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Combustion behavior of indigenous lignite in oxygen-enriched conditions was investigated by using thermogravimetric analyzer (TGA). Combustion tests were carried out in different oxygen concentration (21%O2/79%N2, 30%O2/70%N2, 40%O2/60%N2, 50%O2/50%N2, 60%O2/40%N2, 70%O2/30%N2). Then get the characteristic temperatures. . The model-fitting mathematical approach was used to evaluated the kinetic triplet (f (α),E,A) through Gorbatchev method. The combustion stages were divided into the early combustion stage and the later combustion stage. The calculation showed that the kinetics parameters higher in the early combustion stage than that in the later combustion stage.

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Oo, Chit Wityi, Masahiro Shioji, Hiroshi Kawanabe, Susan A. Roces et Nathaniel P. Dugos. « A Skeletal Kinetic Model For Biodiesel Fuels Surrogate Blend Under Diesel-Engine Conditions ». ASEAN Journal of Chemical Engineering 15, n^o 1 (1 octobre 2015) : 52. http://dx.doi.org/10.22146/ajche.49693.

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The biodiesel surrogate fuels are realistic kinetic tools to study the combustion of actual biodiesel fuels in diesel engines. The knowledge of fuel chemistry aids in the development of combustion modeling. In order to numerically simulate the diesel combustion, it is necessary to construct a compact reaction model for describing the chemical reaction. This study developed a skeletal kinetic model of methyl decanoate (MD) and n-heptane as a biodiesel surrogate blend for the chemical combustion reactions. The skeletal kinetic model is simply composed of 45 chemical species and 74 reactions based on the full kinetic models which have been developed by Lawrance Livermore National Laboratory (LLNL) and Knowledge-basing Utilities for Complex Reaction Systems (KUCRS) under the diesel like engine conditions. The model in this study is generated by using CHEMKIN and then it is used to produce the ignition delay data and the related chemical species. The model predicted good reasonable agreement for the ignition delays and most of the reaction products at various conditions. The chemical species are well reproduced by this skeletal kinetic model while the good temperature dependency is found under constant pressure conditions 2MPa and 4MPa. The ignition delay time of present model is slightly shorter than the full kinetic model near negative temperature coefficient (NTC) regime. This skeletal model can provide the chemical kinetics to apply in the simulation codes for diesel-engine combustion.

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Zhu, Zhouyuan, Canhua Liu, Yajing Chen, Yuning Gong, Yang Song et Junshi Tang. « In-situ Combustion Simulation from Laboratory to Field Scale ». Geofluids 2021 (14 décembre 2021) : 1–12. http://dx.doi.org/10.1155/2021/8153583.

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In-situ combustion simulation from laboratory to field scale has always been challenging, due to difficulties in deciding the reaction model and Arrhenius kinetics parameters, together with erroneous results observed in simulations when using large-sized grid blocks. We present a workflow of successful simulation of heavy oil in-situ combustion process from laboratory to field scale. We choose the ongoing PetroChina Liaohe D block in-situ combustion project as a case of study. First, we conduct kinetic cell (ramped temperature oxidation) experiments, establish a suitable kinetic reaction model, and perform corresponding history match to obtain Arrhenius kinetics parameters. Second, combustion tube experiments are conducted and history matched to further determine other simulation parameters and to determine the fuel amount per unit reservoir volume. Third, we upscale the Arrhenius kinetics to the upscaled reaction model for field-scale simulations. The upscaled reaction model shows consistent results with different grid sizes. Finally, field-scale simulation forecast is conducted for the D block in-situ combustion process using computationally affordable grid sizes. In conclusion, this work demonstrates the practical workflow for predictive simulation of in-situ combustion from laboratory to field scale for a major project in China.

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Sun, Minmin, Jianliang Zhang, Kejiang Li, Guangwei Wang, Haiyang Wang et Qi Wang. « Thermal and kinetic analysis on the co-combustion behaviors of anthracite and PVC ». Metallurgical Research & ; Technology 115, n^o 4 (2018) : 411. http://dx.doi.org/10.1051/metal/2018064.

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The co-combustion characteristics of anthracite and PVC were investigated by thermogravimetric analysis to study its application in BF. First, the combustion characteristics were investigated. It was found the initial combustion temperature (Ti) of blends decreased with the increase of PVC ratio, while its decreasing rate reached maximum when 10% PVC. Aiming for further characterizing the combustion kinetics, ten gas-solid reaction mechanism functions were adopted for different groups. Results showed that Dimensional Diffusion Model is the best model to describe the combustion kinetics of anthracite and PVC. With this model, combustion kinetic parameters were calculated at 5 °C/min, and the Ea decreases with the addition of PVC. Kinetics compensation effect between the Ea and A was also observed. By Fourier Transform Infrared Spectroscopy (FTIR) analysis, significant differences of elements and functional groups were observed. This study provides theoretical guidance for the utilization of PVC as alternative fuels for BF ironmaking.

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Dinde, Prashant, A. Rajasekaran et V. Babu. « 3D numerical simulation of the supersonic combustion of H2 ». Aeronautical Journal 110, n^o 1114 (décembre 2006) : 773–82. http://dx.doi.org/10.1017/s0001924000001640.

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Results from numerical simulations of supersonic combustion of H2 are presented. The combustor has a single stage fuel injection parallel to the main flow from the base of a wedge. The simulations have been performed using FLUENT. Realisable k-ε model has been used for modelling turbulence and single step finite rate chemistry has been used for modelling the H2-Air kinetics. All the numerical solutions have been obtained on grids with average value for wall y+ less than 40. Numerically predicted profiles of static pressure, axial velocity, turbulent kinetic energy and static temperature for both non-reacting as well as reacting flows are compared with the experimental data. The RANS calculations are able to predict the mean and fluctuating quantities reasonably well in most regions of the flow field. However, the single step kinetics predicts heat release much more rapid than what was seen in the experiments. Nonetheless, the overall pressure rise in the combustor due to combustion is predicted well. Also, the k-ε model is not able to predict the fluctuating quantities in the base region of the wedge where there is strong anisotropy in the presence of combustion.

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Gutierrez, Albio D., et Luis F. Alvarez. « Simulation of Plasma Assisted Supersonic Combustion over a Flat Wall ». Mathematical Modelling of Engineering Problems 9, n^o 4 (31 août 2022) : 862–72. http://dx.doi.org/10.18280/mmep.090402.

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This work presents a simplified methodology to couple the physics of a nanosecond pulsed discharge to the process of supersonic combustion in a flat wall combustor configuration. Plasma and supersonic combustion are separately simulated and then coupled by seeding plasma-generated radicals on the combustion domain. The plasma model is built assuming spatial uniformity and considering only the kinetic effects of the nanosecond pulsed discharge. Therefore, a zero-dimensional kinetic scheme accounting for the generation of plasma species is utilized. For the combustion model, the complete set of Favre-averaged compressible Navier Stokes equations along with finite rate chemistry is solved through a control-volume based technique via the commercial software Ansys Fluent. The computational results are compared against experimental studies showing that the proposed methodology can capture the main kinetic effects of the nanosecond pulsed discharge on supersonic combustion. OH concentration contours reveal the presence of an enhanced flame when the plasma is applied following the trends from experimental OH PLIF images. In addition, time evolving temperature and OH concentration contours show that the ignition delay time is reduced with the application of the discharge.

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Komarov, Ivan, Daria Kharlamova, Bulat Makhmutov, Sofia Shabalova et Ilya Kaplanovich. « Natural Gas-Oxygen Combustion in a Super-Critical Carbon Dioxide Gas Turbine Combustor ». E3S Web of Conferences 178 (2020) : 01027. http://dx.doi.org/10.1051/e3sconf/202017801027.

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The paper presents results for chemical kinetics of combustion process in the combustor of oxy-fuel cycle super-critical carbon dioxide gas turbine based on the Allam thermodynamic cycle. The work shows deviation of the normal flame propagation velocity for the case of transition from the traditional natural gas combustion in the N2 diluent environment to the combustion at super-high pressure up to 300 bar in CO2 diluent. The chemical kinetics parametric study involved the Chemkin code with the GRI-Mesh 3.0 kinetic mechanism. This mechanism provides good correspondence between calculation results and test data. The CO2 and N2 diluents temperature, pressure and contents influence the flame propagation velocity and the chemical kinetics parameters in the two gas turbine types. It is demonstrated that the CO2 diluent slows down chemical reactions stronger than the N2 one. The flame propagation velocity in carbon dioxide is four time smaller than in the N2 one. In the oxy-fuel cycle combustor a pressure increase reduces the flame propagation velocity. Increase of the CO2 content from 60 to 79% reduces the flame propagation velocity for 65% at atmospheric pressure and for 94% at super-critical pressure. An increase of the combustor inlet mixture temperature from 300 to 1100 K at super-critical pressure causes the flame propagation velocity increase for 94%. The flame propagation velocities compatible with the traditional gas turbines may be reached at the CO2 diluent content of the O2 + CO2 mixture in the active combustion zone must be below 50%.

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Zhang, Yong-Feng, Xiang-Yun Chen, Qian-Cheng Zhang, Chun-Ping Li et Quan Zhou. « Oxygen-enriched combustion of lignite ». Thermal Science 19, n^o 4 (2015) : 1389–92. http://dx.doi.org/10.2298/tsci1504389z.

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The study is concerned on the oxygen-enriched combustion kinetics of lignite. Thermogravimetric experiments were carried out in a thermogravimetric analyzer under O2/N2 conditions, and operated at different heating rates ranging from 5?C per minute to 25?C per minute. Flynn-Wall-Ozawa method was used to calculate the kinetic parameter. The value of activation energy increased when the oxygen concentration varied from 21% to 70%.

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Várhegyi, Gábor, Zoltán Sebestyén, Zsuzsanna Czégény, Ferenc Lezsovits et Sándor Könczöl. « Combustion Kinetics of Biomass Materials in the Kinetic Regime ». Energy & ; Fuels 26, n^o 2 (23 décembre 2011) : 1323–35. http://dx.doi.org/10.1021/ef201497k.

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Thèses sur le sujet "Kinetic of combustion"

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Marsano, Flavio. « Chemical kinetic modelling of hydrocarbon combustion ». Thesis, Cardiff University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402067.

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Martins, Ivana. « Redução sistemática de mecanismos cinéticos de combustão ». reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2011. http://hdl.handle.net/10183/35625.

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Mecanismos de cinética química detalhada são rotineiramente usados para descrever, a nível molecular, a transformação de reagentes em produtos de combustão, que ocorre através de muitas etapas elementares. Seu uso em modelos computacionais para simular processos de combustão pode gerar informações para melhorar o processo de uso do combustível e o desempenho do processo de combustão, e para quantificar as emissões a partir deste processo. Assim, para descrever um processo de oxidação, o esforço computacional se torna muito grande, exigindo simplificações do mecanismo. O desenvolvimento de mecanismos de cinética química reduzida para processos de combustão visa reduzir a esforço computacional na análise numérica de chamas. Os modelos cinéticos reduzidos podem substituir as equações diferenciais das espécies intermediárias, que são consideradas estarem em estado estacionário, através de relações algébricas. Desta forma, este trabalho desenvolve um método para reduzir a cinética química para a combustão do hidrogênio, monóxido de carbono, e hidrocarbonetos C1- C7, utilizando os pressupostos de estado estacionário. Um mecanismo cinético detalhado do processo de combustão de 439 reações elementares foi estudado e reduzido a mecanismos com, no máximo, 9 passos globais. Comparações de dados experimentais com simulações do perfil de fração de massa de CO2 e H2O, produzidos utilizando o mecanismo cinético reduzido do metano, propano e n-heptano demonstram boa concordância, validando estes mecanismos e, consequentemente, aumentando a confiabilidade dos demais mecanismos estudados.
Detailed chemical kinetic mechanisms are routinely used to describe, at the molecular level, the transformation of reactants to products of combustion, which occurs via many elementary steps. Its use in computer models to simulate combustion processes can generate information to improve the fuel quality and performance of the combustion process, and to quantify the emissions from this process. Thus, to describe a process of oxidation, the computational effort becomes very large, requiring simplifications of the reaction mechanism. The development of reduced kinetic mechanisms for combustion processes aims to reduce the computational effort necessary for the numerical analysis. The reduced models can replace the differential equations of the intermediate species, which are considered to be in steady state, through algebraic relationships. In this way, this work develops a method for reducing the kinetics of combustion for hydrogen, carbon monoxide and hydrocarbons C1-C7, using assumptions of steady-state. A detailed kinetic mechanism containing 439 elementary reactions was analysed and reduced mechanisms with up to 10 steps were developed. Comparisons between experiment and simulations for the reduced kinetic mechanism of methane and propane, show good agreement, validating these mechanisms, and consequently, increasing the reliability of the others mechanisms studied.

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Honnet, Sylvie. « Detailed and reduced kinetic mechanisms in low-emission combustion processes / ». Göttingen : Cuvillier, 2007. http://d-nb.info/98605528X/04.

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ZANONI, M. A. B. « Smoldering Combustion In Porous Media Kinetic Models For Numerical Simulations ». Universidade Federal do Espírito Santo, 2012. http://repositorio.ufes.br/handle/10/4161.

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Made available in DSpace on 2016-08-29T15:32:55Z (GMT). No. of bitstreams: 1 tese_5423_Dissertação_Marco_Aurelio_B_Zanoni_05_03_2012.pdf: 18602750 bytes, checksum: 72079deefb882e9a0b68fad2493b88dc (MD5) Previous issue date: 2012-03-05
Tecnologias avançadas para a geração de energia usando combustíveis não convencionais xisto betuminoso e seu semi-coque, areias betuminosas, petróleo extra-pesado e biomassa proveniente de resíduos sólidos urbanos e de lodo de esgoto - têm em comum processos termoquímicos compostos de complexas reações químicas. Este trabalho trata da formulação e otimização de mecanismos químicos normalmente envolvidos na pirólise do xisto betuminoso e na combustão do xisto betuminoso e seu semi-coque. Problemas inversos (usando o algoritmo de Levenberg-Marquardt) foram empregados para minimizar o erro entre os valores estimados e os dados de termogravimétria para os mecanismos de reação de 3 passos para a pirólise do xisto betuminos, e mecanismos de 4 e 3 passos para o xisto betuminoso e seu semi-coque, respectivamente. Os parâmetros cinéticos, tais como ordem de reação, fator pré-exponencial, energia de ativação e os coeficientes estequiométricos que afetam a secagem, as reações de oxidação, pirólise e descarbonatação foram estimadas com sucesso. Além disso, os erros estatísticos e residuais foram avaliados, resultando em um valor razoável para todas as estimativas e o mecanismo cinético proposto e estimado para a combustão do semi-coque foi aplicado em um código em meios porosos. Um estudo paramétrico entre o perfil de temperatura e a velocidade do ar, e o perfil de temperatura e a concentração de carbono fixo foi desenvolvido. Este estudo mostra que o perfil de temperatura é extremamente influenciado por estes parâmetros, confirmando que a propagação da frente é controlada pela injeção de O2. Palavras-chave: Xisto Betuminoso, Semi-Coque, Pirólise, Combustão, Estimação de Parâmetros, Problemas Inversos, Levenberg-Marquardt, Meios Porosos.

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Leung, Kai Ming. « Kinetic modelling of hydrocarbon flames using detailed and systematically reduced chemistry ». Thesis, Imperial College London, 1995. http://hdl.handle.net/10044/1/7760.

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Fürst, Magnus. « Uncertainty Quantification and Optimization of kinetic mechanisms for non-conventional combustion regimes : Turning uncertainties into possibilities ». Doctoral thesis, Universite Libre de Bruxelles, 2020. https://dipot.ulb.ac.be/dspace/bitstream/2013/307514/5/contratMF.pdf.

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The usage of novel combustion technologies, such as Moderate or Intense Low-oxygen Dilution (MILD) combustion, in the future energy mix provides both a flexible and reliable energy supply, together with low emissions. The implementation though is highly situational and numerical studies can help in the assessment of said technologies. However, the existing uncertainties in numerical modeling of MILD combustion are quite significant, and as detailed kinetics should be considered while modeling MILD combustion, a major part of this uncertainty can be accredited to the kinetics. Combined with the fact that existing detailed mechanisms have been developed and validated against conventional combustion targets, there exists a gap between the performance of existing mechanism and experimental findings. To handle this discrepancy, Uncertainty Quantification (UQ) and Optimization are highly viable techniques for reducing this misfit, and have therefore been applied in this work. The strategy applied consisted of first determining the reactions which showed the largest impact towards the experimental targets, by not only considering the sensitivity, but also the uncertainty of the reactions. By using a so-called impact factor, the most influential reactions could be determined, and only the kinetic parameters with the highest impact factors were considered as uncertain in the optimization studies. The uncertainty range of the kinetic parameters were then determined using the uncertainty bounds of the rate coefficients, by finding the lines which intercepts the extreme points of these maximum and minimum rate coefficient curves. Based on this prior parameter space, the optimal combination of the uncertain parameters were determined using two different approaches. The first one utilized Surrogate Models (SMs) for predicting the behavior of changing the kinetic parameters. This is a highly efficient approach, as the computational effort is reduced drastically for each evaluation, and by comparing the physically viable parameter combinations within the pre-determined parameter space, the optimal point could be determined. However, due to limitations of the amount of uncertain parameters and experimental targets that can be used with SMs, an optimization toolbox was developed which uses a more direct optimization approach. The toolbox, called OptiSMOKE++, utilizes the optimization capabilities of DAKOTA, and the simulation of detailed kinetics in reactive systems by OpenSMOKE++. By using efficient optimization methods, the amount of evaluations needed to find the optimal combination of parameters can be drastically reduced. The tool was developed with a flexibility of choosing experimental targets, uncertain kinetic parameters, objective function and optimization method. To present these features, a series of test cases were used and the performance of OptiSMOKE++ was indeed satisfactory. As a final application, the toolbox OptiSMOKE++ was used for optimizing a kinetic mechanism with respect to a large set of experimental targets in MILD conditions. A large amount of uncertain kinetic parameters were also used in the optimization, and the optimized mechanism showed large improvements with respect to the experimental targets. It was also validated against experimental data consisting of species measurements in MILD conditions, and the optimized mechanism showed similar performance as that of the nominal mechanism. However, as the general trend of the species profiles were captured with the nominal mechanism, this was considered satisfactory. The work of this PhD has shown that the application of optimization to kinetic mechanism, can improve the performance of existing mechanism with respect to MILD combustion. Through the development of an efficient toolbox, a large set of experimental data can be used as targets for the optimization, at the same time as many uncertain kinetic parameters can be used contemporary.
Doctorat en Sciences de l'ingénieur et technologie
This work has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No 643134, and from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme under grant agreement No 714605.
info:eu-repo/semantics/nonPublished

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Qureshi, Nafisa. « A kinetic study of Maya crude oil for in-situ combustion ». Thesis, University of Salford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.484213.

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SOUZA, OBERDAN MIGUEL RODRIGUES DE. « PRESUMED PDF MODEL WITH TABULATED CHEMICAL KINETIC APPLIED FOR SPRAY COMBUSTION ». PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2016. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=30283@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
Neste trabalho, foi desenvolvida uma modificação do modelo para simulação de sprays Diesel com o método de PDF presumida e cinética química tabulada. Através do acoplamento entre a parte química e a parte turbulenta, avaliou-se os efeitos do spray com a metodologia flamelet. Onde o conceito flamelet trata a chama difusiva e transiente como um conjunto de chamas unidimensionais, utilizando o modelo de PDF presumida para a avaliação dos valores turbulentos. A validação do modelo foi realizada com dados experimentais do laboratório Sandia, em uma câmara a volume constante. A validação e a aplicação do modelo foram conduzidas em diferentes tipos de ensaios experimentais: avaliação e comparação para diferentes modelos de cinética química do n-heptano, validação do método para o modelo de turbulência K-epsilon na câmara de volume constante do Sandia para o n-heptano não reativo, validação e comparação do modelo para o spray reativo e aplicação de modelo para o estudo comprimento do ancoramento de chama e para o tempo de atraso de ignição do n-heptano para diferentes temperaturas ambientes. Em geral, a modelagem proposta tem demonstrado excelente capacidade de previsão para a combustão com spray Diesel numa vasta gama de aplicações e é um candidato altamente promissor para outras aplicações em motores Diesel.
In this work, a modification of the model for the simulation of diesel sprays with the presumed PDF method and tabulated chemical kinetics was developed. Through the coupling between the chemical part and the turbulent part, the effects of the spray were evaluated for the flamelet methodology. Where the textit flamelet concept treats the diffusive and transient flame as a set of one-dimensional flames, using the presumed PDF model for the evaluation of turbulent values. The validation of the model was performed with experimental data from the Sandia laboratory, in a chamber at constant volume. The validation and application of the model were conducted in different types of experimental trials: evaluation and comparison for different chemical kinetics models of n-heptane, validation of the method for the turbulence model K-epsilon in the constant volume chamber of the Sandia for non-reactive n-heptane, validation and comparison of the model for the reactive spray and model application for the study of the flame anchoring length and for the ignition delay time of n-heptane at different ambient temperatures. In general, the proposed modeling has demonstrated excellent predictive capacity for diesel spray combustion in a wide range of applications and is a highly promising candidate for other applications in diesel engines.

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Khan, Mohammad A. « Thermochemical kinetic studies of organic peroxides relevant to the combustion of hydrocarbons ». Thesis, University of Aberdeen, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.290241.

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In the combustion of fuels and related organic compounds the initial step consists of a free radical forming process occurring either homogeneously or heterogeneously, such as RH + O_{2 → R + HO}_2 (1) The radical R, reacts with oxygen to produce an alkyl or other peroxy radical: R + O_2 ↔ RO₂ (2) One of the controversies involved in the mechanism for the oxidation of hydrocarbons is the route for the unimolecular decomposition of the hydroperoxy alkyl radical (R_-HOOH). This would be produced as a result of the isomerisation of the alkyl peroxy radical (RO₂). There are three possible unimolecular paths for R_-HOOH together with the addition of oxygen to form hydroperoxy alkyl peroxy radical. This study is concerned with the generation of an alkyl peroxy alkyl radical and its decomposition to both epoxide and olefin formation and at lower temperatures predominantly follows the thermochemically more favourable route. No direct information is available about the rate constants of the two decomposition routes of alkyl peroxyalkyl/hydroperoxy alkyl radicals. There are different ways to find out the rate constants for the decomposition of alkyl peroxy alkyl/hydroperoxy alkyl radical to olefin and oxirane. One such way was a study of the gas phase, hydrogen chloride catalysed decomposition of di-t-butyl peroxide. A surrogate hydroperoxy alkyl radical was generated via this study and the most favourable route for the decomposition of dtBP_-H is confirmed. Again, on thermochemical grounds, the formation of isobutene oxide predominates over the formation of isobutene. The modelling of this study assisted considerably in choosing the reaction steps for a probable mechanism and in the assessment of rate parameters for the individual steps. A bonafide hydroperoxy alkyl radical was generated via the study of the sensitized decomposition of t-butyl hydroperoxide in an uncoated, coated reaction vessel and also in the presence of oxygen. The Arrhenius parameters for the ratio of the rate of formation of isobutene to isobutene oxide was observed experimentally, and are in good agreement with the estimated values in the coated reaction vessel but in uncoated and in the presence of oxygen, this ratio is nearly doubled which suggests that isobutene is formed heterogeneously and surface played an important role. In order to observe the effect of surface: volume ratio on product formation, this system was studied in four different coated reaction vessels and it was concluded that the surface effect was negligible on a coated spherical reaction vessel. The bond dissociation energy DH^o(RO-OH) in alkyl hydroperoxides, is important because the value of the rate constant is critical to cool flames production. The pyrolysis of t-butyl hydroperoxide was carried out, in a bath of isobutane in order to isolate the tBuO-OH bond breaking step. Acetone formation constituted a direct measure of the rate of decomposition of t-butyl hydroperoxide. The O-O bond dissociation energy was found experimentally, which is in good agreement with other group workers values.

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Phadungsukanan, Weerapong. « Building a computational chemistry database system for the kinetic studies in combustion ». Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648233.

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Livres sur le sujet "Kinetic of combustion"

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Norbert, Peters, et Rogg Bernd 1951-, dir. Reduced kinetic mechanisms for applications in combustion systems. Berlin : Springer-Verlag, 1993.

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Westley, Francis. Compilation of chemical Kinetic data for combustion chemistry. Washington : National Bureau of Standards, 1987.

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Westley, Francis. Compilation of chemical kinetic data for combustion chemistry. Gaithersburg, MD : U.S. Dept. of Commerce, National Bureau of Standards, 1987.

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4

Peters, Norbert, et Bernd Rogg, dir. Reduced Kinetic Mechanisms for Applications in Combustion Systems. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-540-47543-9.

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Westley, Francis. Compilation of chemical kinetic data for combustion chemistry. Washington : U.S. Dept. of Commerce, National Bureau of Standards, 1987.

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Westley, Francis. Compilation of chemical kinetic data for combustion chemistry. Gaithersburg, MD : U.S. Dept. of Commerce, National Bureau of Standards, 1987.

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Kamath, Vimod Mangalore. A kinetic study of in-situ combustion for oil recovery. Salford : University of Salford, 1986.

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Krishna, Kundu, Ghorashi Bahman et United States. National Aeronautics and Space Administration., dir. Simplified Jet-A kinetic mechanism for combustor application. [Washington, DC : National Aeronautics and Space Administration, 1993.

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P, Kundu Krishna, Ghorashi Bahman et United States. National Aeronautics and Space Administration., dir. Simplified Jet-A kinetic mechanism for combustor application. [Washington, DC : National Aeronautics and Space Administration, 1993.

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P, Kundu Krishna, Ghorashi Bahman et United States. National Aeronautics and Space Administration., dir. Simplified Jet-A kinetic mechanism for combustor application. [Washington, DC : National Aeronautics and Space Administration, 1993.

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Chapitres de livres sur le sujet "Kinetic of combustion"

1

Turányi, Tamás, et Alison S. Tomlin. « Storage of Chemical Kinetic Information ». Dans Cleaner Combustion, 485–512. London : Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-5307-8_19.

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Blurock, Edward, et Frédérique Battin-Leclerc. « Modeling Combustion with Detailed Kinetic Mechanisms ». Dans Cleaner Combustion, 17–57. London : Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-5307-8_2.

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Faravelli, Tiziano, Alessio Frassoldati, Emma Barker Hemings et Eliseo Ranzi. « Multistep Kinetic Model of Biomass Pyrolysis ». Dans Cleaner Combustion, 111–39. London : Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-5307-8_5.

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Fittschen, Christa. « Kinetic Studies of Elementary Chemical Steps with Relevance in Combustion and Environmental Chemistry ». Dans Cleaner Combustion, 607–28. London : Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-5307-8_23.

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Battin-Leclerc, Frédérique, Henry Curran, Tiziano Faravelli et Pierre A. Glaude. « Specificities Related to Detailed Kinetic Models for the Combustion of Oxygenated Fuels Components ». Dans Cleaner Combustion, 93–109. London : Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-5307-8_4.

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Boettner, J. C., M. Cathonnet, P. Dagaut et F. Gaillard. « Kinetic Modelling of Light Hydrocarbons Combustion ». Dans Mathematical Modeling in Combustion and Related Topics, 421–29. Dordrecht : Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2770-4_27.

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Rubtsov, Nickolai M. « Some Features of Kinetic Mechanisms of Gaseous Combustion ». Dans The Modes of Gaseous Combustion, 83–109. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-25933-8_4.

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Zhang, Jing, et Ping Lu. « Study on Kinetic Parameters and Reductive Decomposition Characteristics of FGD Gypsum ». Dans Cleaner Combustion and Sustainable World, 411–17. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-30445-3_58.

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Klimontovich, Yu I. « Kinetic Description of Autowave Processes and Hydrodynamic Motion ». Dans Dissipative Structures in Transport Processes and Combustion, 144–54. Berlin, Heidelberg : Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-84230-6_11.

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Wang, Zhandong. « Experimental Method and Kinetic Modeling ». Dans Experimental and Kinetic Modeling Study of Cyclohexane and Its Mono-alkylated Derivatives Combustion, 23–37. Singapore : Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-5693-2_2.

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Actes de conférences sur le sujet "Kinetic of combustion"

1

Ju, Yiguang, Joseph K. Lefkowitz, Tomoya Wada, Xueliang Yang, Sang Hee Won et Wenting Sun. « Plasma assisted combustion : kinetic studies and new combustion technology ». Dans 53rd AIAA Aerospace Sciences Meeting. Reston, Virginia : American Institute of Aeronautics and Astronautics, 2015. http://dx.doi.org/10.2514/6.2015-0156.

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Cavanzo, E. A., S. F. Muñoz, A. Ordoñez et H. Bottia. « Kinetics of Wet In-Situ Combustion : A Review of Kinetic Models ». Dans SPE Heavy and Extra Heavy Oil Conference : Latin America. SPE, 2014. http://dx.doi.org/10.2118/171134-ms.

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Abstract In Situ Combustion is an enhanced oil recovery method which consists on injecting air to the reservoir, generating a series of oxidation reactions at different temperature ranges by chemical interaction between oil and oxygen, the high temperature oxidation reactions are highly exothermic; the oxygen reacts with a coke like material formed by thermal cracking, they are responsible of generating the heat necessary to sustain and propagate the combustion front, sweeping the heavy oil and upgrading it due to the high temperatures. Wet in situ combustion is variant of the process, in which water is injected simultaneously or alternated with air, taking advantage of its high heat capacity, so the steam can transport heat more efficiently forward the combustion front due to the latent heat of vaporization. A representative model of the in situ combustion process is constituted by a static model, a dynamic model and a kinetic model. The kinetic model represents the oxidative behavior and the compositional changes of the crude oil; it is integrated by the most representative reactions of the process and the corresponding kinetic parameters of each reaction. Frequently, the kinetic model for a dry combustion process has Low Temperature Oxidation reactions (LTO), thermal cracking reactions and the combustion reaction. For the case of wet combustion, additional aquathermolysis reactions take place. This article presents a full review of the kinetic models of the wet in situ combustion process taking into account aquathermolysis reactions. These are hydrogen addition reactions due to the chemical interaction between crude oil and steam. The mechanism begins with desulphurization reactions and subsequent decarboxylation reactions, which are responsible of carbon monoxide production, which reacts with steam producing carbon dioxide and hydrogen; this is the water and gas shift reaction. Finally, during hydrocracking and hydrodesulphurization reactions, hydrogen sulfide is generated and the crude oil is upgraded. An additional upgrading mechanism during the wet in situ combustion process can be explained by the aquathermolysis theory, also hydrogen sulphide and hydrogen production can be estimated by a suitable kinetic model that takes into account the most representative reactions involved during the combustion process.

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Joklik, Richard G., Ponnuthurai Gokulakrishnan et Michael S. Klassen. « Kinetic Modeling of Plasma-Enhanced Vitiated Combustion ». Dans ASME Turbo Expo 2015 : Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43772.

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Plasma-enhanced combustion can improve the performance of combustion systems for which ignition and flameholding are issues through augmentation of radical species concentrations. Electron impact generates electronically excited N2 and O2, both of which participate in reactions that create atomic oxygen and nitrogen. OH and H concentrations are also altered, both through equilibration of the radical pool, and through direct production pathways from the excited N2 and O2. In the case of vitiated combustion, it has been demonstrated that the presence of NO in the oxidizer stream enhances ignition. However, the impact of the plasma-enhanced radical pool on the effects of vitiation is unknown. It was the goal of this work to explore the impact of plasma-generated species on vitiated kinetics, and the resulting effect on ignition. In this paper we describe the development and validation of a model for ethylene-air ignition by a nanosecond pulsed-plasma. The model employs a zero-dimensional simulation of the plasma to predict the radical concentrations produced by the plasma. These concentrations are then used as input to an ignition delay time calculation using a kinetic mechanism for vitiated combustion that has been previously developed by the authors. The modeling results show that the O-atom, H-atom, N-atom and C2H3 production by the plasma are important in determining ignition delay. The ignition delay time calculations show that both vitiation and plasma effects are important in determining ignition delay, with the plasma effect becoming dominant as the plasma strength is increased, especially in the low-temperature oxidation regime. Thus in designing practical plasma-assisted combustion systems, an understanding of these effects is important in determining the plasma requirements to achieve the desired level of combustion enhancement.

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Suttle, Aaron E., Brian T. Fisher, Dennis R. Parnell et Joshua A. Bittle. « Demonstrating a Direct-Injection Constant-Volume Combustion Chamber As a Validation Tool for Chemical Kinetic Modeling of Liquid Fuels ». Dans ASME 2018 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icef2018-9729.

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Supporting chemical kinetics model development with robust experimental results is the job of shock-tube, rapid compression machine, and other apparatus operators. A key limitation of many of these systems is difficulty with preparation of a fuel vapor-air mixture for heavy liquid fuels. Previous work has suggested that the Cetane Ignition Delay (CID) 510 system is capable of providing data useful for kinetics validation. Specifically, this constant-volume combustion chamber (1) can be characterized by a single bulk temperature, and (2) uses a high-pressure diesel injector to generate rapid fuel-air mixing and thus create a homogeneous mixture well before ignition. In this study, initial experiments found relatively good agreement between experiments and kinetic models for n-heptane and poor agreement for iso-octane under nominally the same ignition delay ranges for ambient conditions under which the mixture is determined to be effectively homogeneous. After excluding potential non-kinetic fuel properties as causes, further experiments highlight the high pressure sensitivity of the negative temperature coefficient (NTC) behavior. While this challenge is well known to kinetic mechanism developers, the data set included in this work (n-heptane at 5 bar and iso-octane at 5–20 bar, each for various equivalence ratios) can be added to those used for validation. The results and system characterization presented demonstrate that this combustion system is capable of capturing kinetic effects decoupled from the spray process for these primary reference fuels. Future work can leverage this capability to provide kinetics validation data for most heavy, exotic, or otherwise difficult to test liquid fuels.

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Dagaut, P., A. Mze´-Ahmed, K. Hadj-Ali et P. Die´vart. « Synthetic Jet Fuel Combustion : Experimental and Kinetic Modeling Study ». Dans ASME 2011 Turbo Expo : Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-45234.

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Fischer-Tropsch liquid fuels synthesized from syngas, also called synthetic paraffinic jet fuel (SPK), can be used to replace conventional petroleum-derived fuels in jet engines. Whereas currently syngas is mostly produced from coal of natural gas, its production from biomass has been reported. These synthetic liquid fuels contain a very high fraction of iso-alkanes, while conventional jet fuels contain large fractions of n-alkanes, cycloalkanes (naphtenes), and aromatics. In that contest, a jet-stirred reactor (JSR) was used to study the kinetics of oxidation of a 100% SPK and a 50/50 SPK/Jet A-1mixture over a broad range of experimental conditions (10 atm, 560 to 1030K, equivalence ratios of 0.5 to 2, 1000 ppm of fuel). The temperature was varied step-wise, keeping the mean residence time in the JSR constant and equal to 1s. Three combustion regimes were observed over this temperature range: the cool-flame oxidation regime (560–740K), the negative temperature coefficient (NTC) regime (660–740K), and the high-temperature oxidation regime (>740K). More than 15 species were identified and measured by Fourier transform infrared spectrometry (FTIR), gas chromatography/mass spectrometry (CG/MS), flame ionization detection (FID), and thermal conductivity detection (TCD). The results consisting of concentration profiles of reactants, stable intermediates and products as a function of temperature showed similar kinetics of oxidation for the fuels considered, although the 100% SPK was more reactive. A surrogate detailed chemical kinetic reaction mechanism was used to model these experiments and ignition experiments taken from the literature. The kinetic modeling showed reasonable agreement between the data and the computations whereas model improvements could be achieved using more appropriate surrogate model fuels. Kinetic computations involving reaction paths analyses and sensitivity analyses were used to interpret the results.

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Rao, G. Arvind, Yeshayahou Levy et Ephraim J. Gutmark. « Chemical Kinetic Analysis of a Flameless Gas Turbine Combustor ». Dans ASME Turbo Expo 2008 : Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50619.

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Flameless combustion (FC) is one of the most promising techniques of reducing harmful emissions from combustion systems. FC is a combustion phenomenon that takes place at low O2 concentration and high inlet reactant temperature. This unique combination results in a distributed combustion regime with a lower adiabatic flame temperature. The paper focuses on investigating the chemical kinetics of an prototype combustion chamber built at the university of Cincinnati with an aim of establishing flameless regime and demonstrating the applicability of FC to gas turbine engines. A Chemical reactor model (CRM) has been built for emulating the reactions within the combustor. The entire combustion chamber has been divided into appropriate number of Perfectly Stirred Reactors (PSRs) and Plug Flow Reactors (PFRs). The interconnections between these reactors and the residence times of these reactors are based on the PIV studies of the combustor flow field. The CRM model has then been used to predict the combustor emission profile for various equivalence ratios. The results obtained from CRM model show that the emission from the combustor are quite less at low equivalence ratios and have been found to be in reasonable agreement with experimental observations. The chemical kinetic analysis gives an insight on the role of vitiated combustion gases in suppressing the formation of pollutants within the combustion process.

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Galie, Peter, Bo Xu et Yiguang Ju. « Kinetic Enhancement of Mesoscale Combustion by Using a Novel Nested Doll Combustor ». Dans 45th AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-576.

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Wang, Huiru, et Jie Jin. « Reduced Chemical Kinetic Mechanism for Jet Fuel Combustion ». Dans 46th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-6709.

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Miyoshi, Akira. « SI Combustion Characteristics of Cyclopentane - Detailed Kinetic Mechanism ». Dans 2019 JSAE/SAE Powertrains, Fuels and Lubricants. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 2019. http://dx.doi.org/10.4271/2019-01-2305.

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Montgomery, C., S. Cannon, M. Mawid et B. Sekar. « Reduced chemical kinetic mechanisms for JP-8 combustion ». Dans 40th AIAA Aerospace Sciences Meeting & Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-336.

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Rapports d'organisations sur le sujet "Kinetic of combustion"

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Pitz, William J., Marco Mehl et Charles K. Westbrook. Chemical Kinetic Models for Advanced Engine Combustion. Office of Scientific and Technical Information (OSTI), octobre 2014. http://dx.doi.org/10.2172/1174293.

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Lempert, Walter R., et Igor V. Adamovich. Kinetic Studies of Nonequilibrium Plasma-Assisted Combustion. Fort Belvoir, VA : Defense Technical Information Center, février 2010. http://dx.doi.org/10.21236/ada524301.

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Pitz, W., et C. Westbrook. Chemical Kinetic Modeling of Hydrogen Combustion Limits. Office of Scientific and Technical Information (OSTI), avril 2008. http://dx.doi.org/10.2172/928549.

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Pitz, W., C. Westbrook et E. Silke. Chemical Kinetic Modeling of Combustion of Automotive Fuels. Office of Scientific and Technical Information (OSTI), novembre 2006. http://dx.doi.org/10.2172/897957.

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Westley, Francis, John T. Herron et R. J. Cvetanovic. Compilation of chemical kinetic data for combustion chemistry :. Gaithersburg, MD : National Bureau of Standards, 1987. http://dx.doi.org/10.6028/nbs.nsrds.73p1.

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Westley, Francis, John T. Herron et R. J. Cvetanovic. Compilation of chemical kinetic data for combustion chemistry :. Gaithersburg, MD : National Bureau of Standards, 1987. http://dx.doi.org/10.6028/nbs.nsrds.73p2.

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Pitz, W., C. Westbook et M. Mehl. Chemical Kinetic Models for HCCI and Diesel Combustion. Office of Scientific and Technical Information (OSTI), octobre 2008. http://dx.doi.org/10.2172/945558.

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Pitz, W., C. Westbrook, M. Mehl et S. Sarathy. Chemical Kinetic Models for HCCI and Diesel Combustion. Office of Scientific and Technical Information (OSTI), novembre 2010. http://dx.doi.org/10.2172/1016930.

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Seshadri, K. Chemical-Kinetic Characterization of Autoignition and Combustion of Surrogate Diesel. Office of Scientific and Technical Information (OSTI), mars 2003. http://dx.doi.org/10.2172/15007311.

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Mitchell, R., R. Hurt, L. Baxter et D. Hardesty. Compilation of Sandia coal char combustion data and kinetic analyses. Office of Scientific and Technical Information (OSTI), juin 1992. http://dx.doi.org/10.2172/7045508.

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